# oncology

> English word · Noun · IPA /ɒŋˈkɒləd͡ʒi/ · frequency rank #18,146

## Definitions
1. The branch of medicine concerned with tumors, including study of their development, diagnosis, treatment, and prevention.

## Etymology
First attested 1857. By surface analysis, onco- + -logy, which see for more.

## Easily confused with
- **ontology** (https://plainspell.com/en/vs/oncology-vs-ontology)

## Common misspellings (12)
`nocology`, `ocnology`, `onccology`, `oncloogy`, `oncolgoy`, `oncollogy`, `oncologgy`, `oncologyy`, `oncoloyg`, `oncoolgy`, `onncology`, `onoclogy`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/oncology